Office chair



FIG. 1 is a front elevational view;

FIG. 2 is a rear elevational view;

FIG. 3 is a left elevational view;

FIG. 4 is a right elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view;

FIG. 7 is a front perspective view and,

FIG. 8 is a rear perspective view.

The broken lines depict the boundary of an office chair and form no part of the claimed design. 

CLAIM We claim the ornamental design for an office chair, as shown and described. 